& U* a( {1 M/ W& l+ ~3 ^( T% STheory is when you know everything but nothing works. ; P# }. m# k: o/ j% f ! A: O Z( V7 y# n% CPractice is everything works but no one knows why.- N1 @$ e+ y7 ?6 g2 X
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这两天的情况是:Theory and practice are combined: nothing works and no one knows why.